Chromatic dispersion compensation in a broadband optical transmission system

摘要

The invention relates to compensating chromatic dispersion and chromatic dispersion slope in optical fiber transmission systems. It proposes using dispersion compensating fiber (12) and a plurality of Bragg gratings (15, 16, 17) for compensating chromatic dispersion in the transmission fiber (4i). Each Bragg grating presents a bandwidth that is greater than 25 nm, so as to enable the system to be used in broad bands. In addition, the absolute value of the compensation provided by each Bragg grating is less than 250 ps/nm, thus ensuring that the grating remains easy to manufacture in spite of its broad band. The invention applies in particular to very high data rate systems (above 40 Gbit/s for each channel), with a utilization band extending between 1250 nm to 1650 nm.